<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>svg</title>
</head>

<body>
    <svg xmlns="http://www.w3.org/2000/svg" version="1.1">
        <circle cx="100" cy="50" r="40" stroke="black" stroke-width="2" fill="red" />
    </svg>
    <div style="width: 100px;height: 100px;background-color: red;margin-bottom: 50px;"></div>

    <!--viewBox: min-x, min-y, width and height -->
  <svg width="600px" height="600px" viewBox="0 0 1200 1200" style="border: 1px solid #ccc;">
    <circle cx="600" cy="200" r="150" stroke="red" fill="lightgreen" stroke-width="8"/>
  </svg>
     
</body>

</html>